Commonly used expressions in PHP include: arithmetic expressions: used for mathematical operations comparison expressions: comparing two values logical expressions: combinational logic conditional expressions: simplified if-else statements array expressions : Create array string expression: Create string
Commonly used expressions in PHP
Provided in PHP A variety of expressions for performing logical calculations in code. The following are some of the most commonly used expressions in PHP:
1. Arithmetic expressions
Arithmetic expressions are used to perform mathematical operations. The following operators can be used:
For example:
<code class="php">$result = 10 + 5 * 2; // 20</code>
2. Comparison expression
Comparison expressions are used to compare two values. The following operators can be used:
For example:
<code class="php">if ($x == 10) { // 执行操作 }</code>
3. Logical expressions
Logical expressions are used to combine logical conditions. The following operators can be used:
For example:
<code class="php">if ($x > 10 && $y < 5) { // 执行操作 }</code>
4. Conditional expression (ternary operator)
Conditional expression is a simplified if-else statement. It has the following syntax:
<code class="php">(condition) ? true_value : false_value</code>
For example:
<code class="php">$result = ($x > 0) ? "positive" : "negative";<p><strong>5. Array expression</strong></p> <p>Array expression is used to create array. The syntax is as follows: </p> <pre class="brush:php;toolbar:false"><code class="php">[key1 => value1, key2 => value2, ...]</code>
For example:
<code class="php">$arr = ['name' => 'John', 'age' => 25];</code>
6. String expression
String expression is used to create string. The syntax is as follows:
<code class="php">"string"</code>
or
<code class="php">'string'</code>
For example:
<code class="php">$name = "John Smith";</code>
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