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For (variable in object) statements

The statement is true

Consider an example in which three statements are executed if the condition is true: if (var 5) echo "The variable is greater than 5. / So, now let's set it to 5 var 5; echo "In fact, now it is equal to 5. If strings need to be compareda common requirementuse the PHP string library function strcmp( ). The strcmp( ) function is a string function used in this book and is discussed in more detail later in Section 2.6. Conditionals add control to scripts and permit branching so that different statements are executed depending on whether expressions are true or false. There are two branching statements in PHP: if, with the optional else clause, and switch, usually with two or more case clauses. WARNING : Never assume that expressions combined with the Boolean operators and are evaluated. PHP uses short-circuit evaluation when determining the result of a Boolean expression. More complex expressions can be formed through combinations of the Boolean operators and the liberal use of parentheses. 1) echo "Does not equal one! This evaluates as true and prints the message if var isn't equal to 1. The operator! is usually referred to as the not equals operator, because the exclamation mark character negates an equality expression. Any of the Boolean expressions we have discussed can be negated with an exclamation mark!, the unary not operator. The following two expressions are equivalent: if (!(var! 1) echo "variable is one if (var 1) echo "variable is one So are the following: if (var 10) echo "less. WARNING : If the equality operator and the assignment operator are unfamiliar beware: they are easy to inadvertently interchange. This is a very common bug and hard to detect. The incorrectly formed conditional expression (var 1) always evaluates as true, because the assignment that actually occurs always succeeds. In this form, the if keyword is followed by a boolean expression, the keyword then, a list of statements and the final keyword end. When the statement is executed, the boolean expression is evaluated and if the result is true the statements in the statement list are executed.
if so, if. Else <i>true</i> <i>true</i> Statement The <i>statement</i> if statement <i>true</i> conditionally <u>statement</u> controls execution <em>statement</em> and its <u>statement</u> <em>true</em> use in <strong>statement</strong> PHP is <strong>statement</strong> as in any <i>true</i> other <em>statement</em> language. The basic format of an <em>statement</em> if statement is to <em>true</em> test whether a condition is true <i>statement</i> <i>true</i> and, <em>true</em> <em>true</em> to execute one or more statements. 8672

/ The normal equality check would return true if (5.0 5) echo "This always prints NOTE : The conditional expressions described here can compare strings but usually not with the expected results.
parentheses ensure <em>statement</em> that evaluation occurs in <em>true</em> the <i>statement</i> <u>true</u> required order. If (var 6)) <i>true</i> (var2 <strong>true</strong> <i>true</i> 7)) (var 4)) <u>true</u> (var2 1)) <em>true</em> echo "Expression is true <strong>true</strong> As in assignment <em>statement</em> expressions, equality and <i>statement</i> inequality <em>true</em> are <u>statement</u> <strong>true</strong> the <strong>statement</strong> two basic comparisons, <u>statement</u> but numbers are also compared to determine which <em>true</em> is greater or lesser. 5115

Start page O'Reilly: Web Database Applications with PHP MySQL rating of books rating of authors reviews copyrights The control structures in PHP are similar in syntax to those in other high-level programming languages.
consider an example: <i>statement</i> var <i>true</i> 1; if (var 1)) <strong>true</strong> echo "Equals <i>statement</i> one! Conditional Expressions The <strong>statement</strong> <i>true</i> <u>statement</u> most <strong>statement</strong> common <i>true</i> conditional comparison <em>statement</em> is to <em>statement</em> <em>true</em> test <strong>true</strong> <u>true</u> the <em>statement</em> equality of two <i>statement</i> expressions <strong>statement</strong> with <i>statement</i> the <strong>true</strong> Boolean result <em>true</em> of true or false. Equality is tested with the double-equal operator,. 9134

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